Optical disc base plate and process for producing the same.

摘要

The invention discloses an optical disc base plate obtained by curing with irradiation of light a light- or radiation-curable resin composition in which a photopolymerization initiator is contained in an amount of 0.5 to 5 parts by weight per 100 parts by weight of a resin composition comprising the compounds (1), (2) and (3) mixed in amounts falling in the area defined by lines A-B-C-D-E-A in the triangular diagram of Fig. 1, and a process for producing an optical disc base plate which comprises arranging a stamper carrying an information pattern thereon and a light-transmittable flat plate in opposition to each other so as to form a space there­between, dividing said space into a main space and a resin reservoiring space by a notching ring provided to the light-transmittable plate so as to form a small clear­ance at a part of the space, casting a light-curable resin into the entirety of the main space and a part of the resin reservoiring space from an inlet, and curing the resin by irradiation of energy from an external energy source.